Patent US5404327A successfully refreshed from Google Patents.
US2644155A
Expired / Lapsed
US
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Blind landing system
Assignee: Individual
•
Filing: 1945-11-21
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Granted: 1953-06-30
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Expires: 1965-11-21
Abstract
No abstract record available.
Inventors
- 👤 Jr Robert A Emmett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:20
CPC Classifications
G; G01; G01S; G01S1/00; G01S1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2424984A
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US2426218A
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US2427029A
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US2426992A
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US2408048A
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US2441956A
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US2430292A
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US2430307A
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US2508384A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |